fix opencode + use free model

flake.lock

@@ -271,11 +271,11 @@
         "treefmt-nix": "treefmt-nix"
       },
       "locked": {
-        "lastModified": 1767866249,
-        "narHash": "sha256-34M8rysW3vuOYijI/Ns59bPkKPecaQW5oOupR45IRwQ=",
+        "lastModified": 1768227710,
+        "narHash": "sha256-m6GRI1hzt/jfKaPyyraxUCi0HAc6ROwasemyeWGulJA=",
         "owner": "numtide",
         "repo": "llm-agents.nix",
-        "rev": "7173b37ee4ff714e34dab539aeccb0cc7e4b24dc",
+        "rev": "321aab84a04492df7230090eabc61fa0b224a106",
         "type": "github"
       },
       "original": {
@@ -553,11 +553,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1767801790,
-        "narHash": "sha256-QfX6g3Wj2vQe7oBJEbTf0npvC6sJoDbF9hb2+gM5tf8=",
+        "lastModified": 1768158989,
+        "narHash": "sha256-67vyT1+xClLldnumAzCTBvU0jLZ1YBcf4vANRWP3+Ak=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "778a1d691f1ef45dd68c661715c5bf8cbf131c80",
+        "rev": "e96d59dff5c0d7fddb9d113ba108f03c3ef99eca",
         "type": "github"
       },
       "original": {

home-manager/progs/opencode.nix

@@ -33,7 +33,7 @@
     settings = {
       theme = "opencode";
 
-      model = "openrouter/minimax/minimax-m2.1";
+      model = "opencode/glm-4.7-free";
       # small model used for titles
       small_model = "openrouter/openai/gpt-oss-20b:free";